DO NOT soak the dust cup assembly in water. DO NOT wash HEPA filter with water. Dust cup, filter cover must be completely air dried before use. Pull out the dust cup (together with the HEPA filter and filter cover). Grip the dust cup with one hand, and with the other hand, grip the centre of the HEPA filter and twist to the right (clockwise) until the dot on the HEPA filter aligns with the “Unlock ” icon on the dust cup. Lift out the HEPA filter and filter cover. Grip the filter cover with one hand, and with the other hand, grip the centre of the HEPA filter and twist to the left (anticlockwise) until the dot on the HEPA filter aligns with the “Unlock” icon on the filter cover. Lift out the HEPA filter. Remove the debris in the dust cup, HEPA filter and filter cover; the dust cup and filter cover can be rinsed with water or wiped clean with a moist cloth.